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耐盐和盐敏感弗兰克氏菌菌株中氮代谢的调控

Regulation of nitrogen metabolism in salt tolerant and salt sensitive Frankia strains.

作者信息

Srivastava Amrita, Mishra Arun Kumar

出版信息

Indian J Exp Biol. 2014 Apr;52(4):352-8.

Abstract

Effect of salinity (0, 50, 100, 250, 500 and 750 mM NaCI) was observed on some important physiological parameters of nitrogen metabolism such as nitrate uptake, intracellular and extracellular ammonium status and activities of nitrogenase, nitrate reductase, nitrite reductase and glutamine synthetase among Frankia strains differing in their salt tolerance capacity. Nitrogenase activity closely followed the growth pattern with regular decline on NaCI supplementation. All the other enzymes showed optimum activity at 100 mM and declined further. Co-regulation of the nitrate uptake system and sequential enzyme activities plays a crucial role in governing the nitrogen status of strains during salt stress. HsIil0 experiencing minimum decline in enzyme activities and best possible nitrogen regulation under NaC1 replete condition showed adequate nutritional management. Among all the strains, HsIil0 proved to be salt tolerant on account of above features while the salt sensitive strain HsIi8 lacked the ability to regulate various steps of nitrogen metabolism during salinity, and thus Frankia strain HsIil0 can potentially serve as a potential biofertilizer in the saline soil.

摘要

在耐盐能力不同的弗兰克氏菌菌株中,观察了盐度(0、50、100、250、500和750 mM氯化钠)对氮代谢一些重要生理参数的影响,如硝酸盐吸收、细胞内和细胞外铵状态以及固氮酶、硝酸还原酶、亚硝酸还原酶和谷氨酰胺合成酶的活性。固氮酶活性紧密跟随生长模式,随着氯化钠添加量的增加而有规律地下降。所有其他酶在100 mM时表现出最佳活性,并进一步下降。硝酸盐吸收系统和顺序酶活性的共同调节在盐胁迫期间控制菌株的氮状态方面起着关键作用。在氯化钠充足的条件下,HsIil0的酶活性下降最小,并且具有最佳的氮调节能力,显示出良好的营养管理。在所有菌株中,由于上述特征,HsIil0被证明具有耐盐性,而盐敏感菌株HsIi8在盐度条件下缺乏调节氮代谢各个步骤的能力,因此弗兰克氏菌菌株HsIil0有可能作为盐碱土壤中的潜在生物肥料。

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